Men are dying younger than their female counterparts and of eminently preventable and treatable diseases, according to the Men’s Health Forum, an organization in the U.K. that aims to improve mortality rates in men.

Men with a strong sense of masculinity are about 50% less likely than their not-so-macho peers to seek out preventative health-care services, according to a survey of 1,000 middle-aged American men. What’s more, even though people with higher job status are usually more likely to follow health-care guidelines, that pattern doesn’t seem …